Chipped Stones has announced its new title Acidity, a new bagatelle-like game for iOS devices is available now on iTunes as a free-to-play download. Unlike the traditional game, the player has some control over the ball after its release, as well as other novel elements such as mobile pins.

The developers of Acidity found that they quickly got bored with the type of game where the balls just follow the laws of physics after release. Something like a pinball flipper in the right place would be so satisfying, but actual pinball requires too much concentration to be relaxing. What this game offers is a happy medium of challenge and control, allowing the casual player to achieve and improve scores by interacting with the ball throughout its trajectory.

But just when you think you’ve got it, a new wrinkle arises: at first just a pin in an awkward place, then more pins, then pins that move, and so on. On top of that, the balls keep coming sooner after each other and falling and bouncing faster.

The game is very forgiving of beginner players, allowing progress even without perfect scores at lower levels. Acidity is available for free with ten levels. The more interesting challenges, however, are withheld for in-app purchase, and we won’t spoil the surprises here. The Acidity website provides further details and a support forum.

Acidity is rated 4+ and is compatible with iPhone, iPod touch, and iPad running iOS 4.0 or later.